Early today, Moody's Investors Service upgraded India's local and foreign currency issuer ratings to Baa2 from Baa3 and changed the outlook on the rating to stable from positive.

This upgrade comes after 13 years. India's sovereign credit rating was last upgraded in January 2004 to Baa3 (from Ba1).

"The rating upgrades for IOC, BPCL and HPCL follow the upgrade of the sovereign rating and reflect the strategic importance of the oil marketing companies as they own and operate the majority of the country's fuel refining entities and most of the fuel distribution infrastructure," Moody's said.

The upgrade of the foreign currency ratings of ONGC follow the raising of the ceiling for foreign currency bonds, it said.

While for PLL the upgrade is in step with changes in rating of IOC and BPCL, Oil India Ltd (OIL) rating remains unchanged at Baa2.

"The upgrade in ratings for NTPC, NHPC, NHAI and GAIL follows the upgrade of the Indian sovereign rating and reflects the strategic importance of these entities to the country, as well as their close operational and financial links with the government," Moody's said.

NTPC's current installed capacity represents 15.8 per cent of India's installed power generation capacity. NHPC is the largest hydro power generator of India and accounted for about 15 per cent of country's total installed hydro capacity of around 44.5 GW as of March 2017.

Moody's said the baseline risk of NHAI is closely related to the Indian's Government's financial strength.

"As a result, the baseline risk for NHAI is effectively the default risk of the Indian government," it said.

GAIL has a dominant position in the gas transmission business in India. Its transmission pipelines represented around 75 per cent of country's network and the company had around 60 per cent market share in gas marketing.

(This article has not been edited by Zeebiz editorial team and is auto-generated from an agency feed.)